Not Marcks, nor Paulus', nor Halder's, nor anyone's plan was feasable. Germany could not defeat the Soviet Union, specially without ANY plan at all… (which was the actual case, because no plan was rejected and none accepted…)

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun